JPH0361267B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method of sequentially concentrically forming annular recording tracks on a magnetic recording surface of a rotating recording medium, for example, a rotating magnetic sheet (hereinafter simply referred to as a magnetic sheet). The present invention relates to a rotating magnetic sheet device that is useful for use in a recording/reproducing device for recording or reproducing a rotating recording medium in which the magnetic sheet is formed.

[Conventional technology]

The applicant has already developed a novel device that can record and/or reproduce required still image signals on a magnetic sheet while intermittently moving a magnetic head in the radial direction of the magnetic sheet that is rotating at high speed. We are proposing a rotating magnetic sheet device.

[Problem to be solved by the invention]

By the way, this type of device has high reliability and
In addition, in order to realize stable recording and reproduction, it is particularly important to obtain stable sliding contact between the magnetic sheet rotating at high speed and the magnetic head.

Therefore, in order to obtain stable sliding contact between the magnetic sheet and the magnetic head, the present applicant installed a guide plate near the magnetic head to stabilize the rotation of the magnetic sheet, and also installed a guide plate near the magnetic head. A regulating plate having a sheet regulating surface that is substantially parallel to the sheet guiding surface of the guide plate is attached to the magnetic head at a position facing the plate, that is, at a position opposite to the guide plate with the magnetic sheet in between. A rotating magnetic sheet device has already been proposed in which the rotating magnetic sheet device is provided at a predetermined interval.

However, in the past, it has not been possible to easily adjust the distance between the regulating plate and the magnetic head with a simple structure.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a rotating magnetic sheet device in which the adjustment of the distance between the regulating plate and the magnetic head is extremely simple and can be realized with high precision.

[Means to solve the problem]

That is, in order to achieve the above object, the rotating magnetic sheet device according to the present invention has an insertion position in which a magnetic sheet jacket can be inserted with respect to a mounting board, and a magnetic sheet built in the magnetic sheet jacket is rotationally driven. A cassette holder into which the magnetic sheet jacket is inserted is attached movably to each possible operating position, and the mounting board is provided with
A magnetic head is provided, and a regulating plate for regulating the position of the magnetic sheet is attached to the cassette holder so as to be movable relative to the cassette holder, and when the cassette holder is moved to the operating position, The position of the regulating plate is regulated relative to the magnetic head.

The position of the regulating plate may be adjusted by providing a spacing adjustment screw for adjusting the spacing from the magnetic head.

Further, the criterion for adjusting the distance between the regulating plate and the magnetic head using the distance adjusting screw is at least the rotation center position of the magnetic sheet and a position outside the outer periphery of the magnetic sheet and within the sheet jacket. It may be decided based on two points.

Furthermore, the distance adjusting screw may be configured to be able to adjust the distance from a position opposite to the regulating plate across the cassette holder.

[Effect]

According to the present invention, since the regulating plate is movably attached to the cassette holder, when the cassette holder is moved to a position where the magnetic sheet can operate, the regulating plate can be accurately positioned relative to the magnetic head. can do. The distance between the regulating plate and the magnetic head can be adjusted using the spacing adjustment screw provided on the regulating plate. Further, the criterion for adjusting the distance between the regulating plate and the magnetic head using the distance adjusting screw is at least two points: a rotational center position of the magnetic sheet and a position outside the outer periphery of the magnetic sheet and within the sheet jacket. Since it is determined by points, the position of the regulating plate can be set correctly even with respect to the magnetic sheet.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the state before a magnetic sheet jacket is inserted into a cassette holder constituting a rotating magnetic sheet device.

In FIG. 1 above, a cassette holder 4 into which a magnetic sheet jacket 3 can be inserted and removed is attached to a mounting board 2 on which a magnetic recording device 1 is mounted so as to be openable and closable via a hinge shaft 4a. .
That is, the cassette holder 4 has an insertion position with respect to the mounting board 2 where the magnetic sheet jacket 3 can be inserted (see FIG. 1), and the magnetic sheet 6 in the magnetic sheet jacket 3 can be rotationally driven as described later. They are mounted so that they can be moved to their respective operating positions (see FIGS. 2 and 3). A disk-shaped magnetic sheet 6 is rotatably housed in a jacket housing 5 constituting the outer housing portion of the magnetic sheet jacket 3, and on this sheet 6, images such as still image information are stored. The signals are magnetically recorded to form a plurality of annular tracks. A window 7 is formed in a part of the jacket housing 5 so that a part of the magnetic recording surface 6a of the magnetic sheet 6 is exposed to the outside. One or more (one in this embodiment) magnetic head 8 is inserted into the window 7, and the magnetic head 8 magnetically records a plurality of video signals on the magnetic sheet 6. ing. This magnetic head 8 is inserted into the window 7 and moves in the radial direction of the magnetic sheet 6 (for example, from the inner circumferential side position to the outer circumferential side position) every rotation of the magnetic sheet 6, and each time the magnetic sheet 6 Video signals are magnetically recorded in a ring on the top. Further, on the mounting board 2 is a sheet rotating table 10 on which a reinforcing member 9 provided at the center of rotation of the magnetic sheet 6 is placed.
, a magnetic head 8 for recording and/or reproducing, for example, still image information on the magnetic sheet 6 in the magnetic sheet jacket 3;
a guide plate 12 for stabilizing the state of contact with the magnetic sheet 6; a head movement operation unit 13 for automatically and intermittently feeding the magnetic head 8 in the radial direction of the magnetic sheet 6; and a sheet rotation shaft. 10 units
A drive motor 14 and the like for rotationally driving the components are provided.

The magnetic head 8 is attached to the middle part of the moving arm 15 that constitutes the head moving operation section 13.
The head protrusion window 16 formed in the guide plate 12 for stabilizing the contact with the head is viewed from a lower position. A pair of height regulating pins 17, 17 are installed on this guide plate 12. These pins 17, 17 are provided so as to provide a predetermined distance from a regulating plate 19, which will be described later, provided on the case cover 18 side of the cassette holder 4.

Note that the movable arm 15 is provided with a spring 2.
One end 20a of the arm 15 is locked, and the movable arm 15 is constantly pulled in the direction of the arrow A in FIG. 1 about the pivot 21.

A fixed shaft 23 that is inserted into the insertion hole 22 on the side of the magnetic sheet jacket 3 is arranged approximately in the center of the mounting board 2. As shown in the figure, the rotary table 10, which also serves as a flywheel, is rotatably mounted via a ball bearing 24. A belt 25a is stretched between the rotary table 10 and a belt pulley 25 attached to the drive shaft 14a of the drive motor 14. Fixed shaft 2 above
As shown in FIG. 2, when the magnetic sheet jacket 3 is installed in the magnetic recording device 1, the tip end 23a of the magnetic sheet 6 passes through the insertion hole 22 of the reinforcing member 9 attached to the center of the magnetic sheet 6. The distal end portion 23a is adapted to abut and engage with a spacing adjustment screw 26 screwed onto the distal end of the regulating plate 19. ing.

Further, the guide plate 12 is connected to the magnetic sheet jacket 3.
The guide plate 12 is inserted into the window 7 of the sheet jacket 3 to guide the magnetic sheet 6 in the sheet jacket 3 so that it can be rotated in a stable state. As shown in the figure, a plate-shaped horizontal portion 27 and a proximal end block 28 formed at its proximal end.
A sheet guide surface 27a is formed on the upper end surface of the horizontal portion 27 in the form of a smooth surface for guiding the magnetic sheet 6 so as to be substantially parallel to its rotating surface. has been done. This sheet guide surface 27a is arranged around the head abutting portion where the magnetic head 8 abuts against the magnetic sheet 6.
This is for adjusting the position of the sheet 6 from the bottom side (see Fig. 2). For this purpose, the circumferential edge 27b of the sheet guide surface 27a is chamfered in an arc shape. In addition, the base end block 28
The lower surface of the magnetic head 8 is provided with contact sliding portions 29a and 29b of the head slider 29 to which the magnetic head 8 is attached.
A guide surface 28d on which the upper surfaces of are slidably facing each other,
28e is formed. Each guide surface 28
d and 28e are parallel to the sheet guide surface 27a. Further, the above-mentioned window portion 16 for protruding the magnetic head is formed through the central portion of the horizontal portion 27. For magnetic recording on the magnetic sheet 6, this window section 16 allows the magnetic head 8 to cover all recording tracks from the innermost track T1 to the outermost track Tn of the sheet 6, as shown in FIG. An opening is provided to allow the magnetic head 8 to protrude onto the sheet guide surface 27a of the guide plate 12 for tracking.

Next, as described above, the head moving operation section 13 moves the magnetic head 8 intermittently in the radial direction of the magnetic sheet 6 while moving the magnetic head 8 from the innermost track T1 to the outermost track on the magnetic sheet 6, for example.
This is for tracking operation of the magnetic head 8 so that required information can be sequentially magnetically recorded over the positions Tn. In this illustrated example,
The head moving arm 1 is mainly composed of an L-shaped head moving arm 15 that is rotatably supported by a pivot 21 mounted on the mounting board 2.
A magnetic head 8 is integrally attached to a head slider 29 attached to the middle of the magnetic head 5 . Note that the magnetic head 8 is connected to a magnetic sheet 6 between the head slider 29 and the head moving arm 15.
A plate spring (not shown) is interposed for the purpose of elastically abutting the base plate.

On the other hand, as shown in FIG. 5, the cassette holder 4 is composed of a plate-shaped receiving frame 52 that receives the magnetic sheet jacket 3, and a case cover 18 that covers the entire magnetic sheet jacket 3 from above. There is.

On both sides of the former receiving frame 52, as shown in FIG.
Receiving portions 52a, 52 having a substantially U-shaped cross section for receiving b.
b is formed, and the top plate portion 52c constituting the top portion of the receiving frame 52 has a circular hole 53 through which a scale 51 provided on the magnetic sheet jacket 3, which will be described later, can be visually recognized from the outside, and a regulating plate. Opening 5 formed so as not to become an obstacle when moving 19
4 is provided.

Moreover, on one side 52b of this receiving frame 52,
An engagement groove 52d is provided, and a stopper portion 55 for temporarily fixing the cassette holder 4 to the mounting board 2 in the operating position is formed at the tip thereof. This stopper portion 55 is adapted to engage with a locking piece 56 provided on the mounting board 2 side.

In addition, a circular hole 57 having the same shape as the circular hole 53 provided in the receiving frame 52 is formed in the case cover 18 at a position corresponding to the circular hole 53 provided in the receiving frame 52. One of the curved bent portions 18a and 18b, 18b
An engaging pin 58 that is inserted into and engaged with the engaging groove 52d of the receiving frame 52 is fixed to the receiving frame 52. This engagement pin 58 is provided to prevent the case cover 18 from being opened too much with respect to the receiving frame 52. Therefore, due to the functions of the engagement pin 58 and the engagement groove 52d, the receiving frame 52 and the case cover 18 cannot be separated.

A regulating plate 19 is disposed on the latter case cover 18, and this regulating plate 18 has a rectangular shape for regulating the position of the magnetic sheet 6 from the upper surface side, as shown in FIGS. 1 and 4. Sheet regulation part 19a of
and a plate-shaped mounting portion 19b integrally formed on the upper surface of the regulating portion 19a, and is disposed at a position on the case cover 18 side facing the magnetic head 8. In this embodiment, the regulation plate 19
As shown in FIG. 4, the magnetic head 8 and the guide plate are supported movably in the axial direction by four locking pins 30a, 30b, 30c and 30d set on the case cover 18. He is facing 12.

Further, a compression spring 31 is interposed between the case cover 18 and the regulating plate 19.
In this embodiment, the compression spring 31 is housed in a recess 32 provided at the center of the upper surface of the regulating plate 19. Therefore, due to the elastic force of the compression spring 31, the regulating plate 19 always holds each locking pin 30.
a, 30b, 30c, and 30d are elastically biased toward the magnetic head 8. Above mounting part 19
As shown in FIG. 4, the distal end of b protrudes to a position in front of the guide plate 12, and the above-mentioned interval adjustment screw 26 is screwed onto this distal end.

Furthermore, a smooth sheet regulating surface 19c as shown in FIG. 2 is formed on the lower end surface of the sheet regulating portion 19a constituting the regulating plate 19. As shown in FIG. This regulating surface 19c is for positionally regulating the seat surface 6a of the magnetic sheet 6 at a predetermined distance from both upper and lower sides with the sheet guiding surface 27a of the guide plate 12 described above. Regulation plate 1 having this regulation surface 19c
The height adjustment of the magnetic head 9 with respect to the magnetic head 8 is performed using the lower end surface 2 of the interval adjustment screw 26 screwed onto the mounting portion 19b.
6a comes into contact with the tip 23a of the fixed shaft 23, and a pair of height regulating pins 17, which the lower end surfaces 33a, 34a of two interval adjustment screws 33, 34 screwed onto the rear end of the mounting portion 19b come into contact with. 17 head 17a, 1
7b is used as the standard.

As described above, the spacing adjustment screws 26, 33, and 34 are arranged between the sheet guiding surface 27a of the guiding plate 12 and the magnetic head 8, and the sheet regulating surface 19c of the regulating plate 19 disposed at a position facing thereto. These adjusting screws 26, 33, 34 are provided on the regulating plate 19 to adjust the spacing between the
The distance can be adjusted from a position on the opposite side of the regulating plate 19 with the cassette holder 4 in between (a position on the case cover 18 side). For this purpose, the screws 26, 33, and 34 are located at the positions of the case cover 18 corresponding to the respective spacing adjustment screws 26, 33, and 34.
Driver insertion holes 59a, 59b, and 59c for inserting a screwdriver or the like used when screwing in or loosening the screws 3 and 34 are formed.

Note that a leaf spring 60 is fixed to the inner surface of the case cover 18 with screws 61, 61.
This is provided for the purpose of separating the receiving frame 52 from the case cover 18 by a predetermined distance so that the magnetic sheet jacket 3 can be easily inserted through the cassette insertion opening 53e. In addition, when the magnetic head 8 is brought into sliding contact with the magnetic sheet 6, a relief portion of the magnetic sheet 6 is formed near the center of the sheet regulating surface 19c at a position facing the magnetic head protrusion window 16. A semicircular grooved portion 35 is formed so as to form a groove. Further, the circumferential edge 19d of the sheet regulating surface 19c is chamfered in an arc shape.

There are two through holes 36a and 36b between the concave portion 35 of the regulation plate 19 and one interval adjustment screw 26.
A detection coil accommodating portion 36 having a substantially figure eight shape is formed, and a detection coil 37 is disposed within this accommodating portion 36 . At the center of the detection coil 37, a yoke 3 is suspended from one end of a plate-shaped support member 38 so as to face into each of the through holes 36a.
9 is placed. The other end of the support member 38 is fixed to the regulating plate 19 with fixing screws 40a, 40a, and the upper surface of the support member 38 is provided with a wire for transmitting the output detected by the detection coil 37 to a predetermined electronic circuit. Necessary wiring 41a, 41 for guiding
One end of b... is soldered.

The detection coil 37 is for detecting a rotational phase detected object, which will be described later. This detection coil 37 was attached to the regulation plate 19 because of the regulation plate 1.
9 is attached to the guide plate 1 by height regulating pins 17, 17, etc.
2, and by providing the detection coil 37 on such a regulating plate 19, the rotational phase of the object to be detected can be detected with high precision. .

On the other hand, a reinforcing member 9 that receives a fixed shaft 23 on the side of the magnetic recording device 1 and is held by this fixed shaft 23 is provided at the center of rotation of the magnetic sheet 6 in the magnetic sheet jacket 3 attached to the magnetic recording device 1. installed. The reinforcing member 9 is made of a resin material such as plastic and is shaped like a disk or a plate. An insertion hole 22 for inserting the fixed shaft into which the fixed shaft 23 is inserted is formed through the reinforcing member 9 at substantially the center thereof.

As shown in FIG. 2, an annular magnetic body 42 is integrally attached to the center side of the lower surface 9a of the reinforcing member 9. As shown in FIG. As shown in FIG. 2, this magnetic body 42 is disposed at a position opposite to an annular magnet 43 that is integrally provided on the rotary table 10 that rotates at high speed around a fixed shaft 23.
It is designed to be attracted by the magnetic force of the magnet 43. Therefore, when the turntable 10 rotates, the magnetic sheet 6 rotates in the same direction while the magnetic body 42 is attracted by the magnetic adsorption action of the magnet 43.

In order to detect the rotational phase of the magnetic sheet 6, there is a rotational phase detected object 44, which is detected by the detection coil 37, and a rotational phase detected object 44, which is located at a position facing the insertion hole 22 of the reinforcing member 9, and this detected object. 44 and a balance magnetic pin 45 having about the same weight are buried therein. The detected object 44 is connected to a magnetic sheet 6 along with one detection coil 37 provided on the rotation locus of the detected object 44 (see FIG. 7).
This is to detect whether or not the magnetic sheet 6 is rotating at a constant rotational speed, and each time the detected object 44 rotates and approaches the detection coil 37 as the magnetic sheet 6 rotates, The detection coil 3 sends a detection signal for detecting the rotational phase of the magnetic sheet 6.
The purpose is to detect the rotational speed of the magnetic sheet 6 by generating it from the magnetic sheet 7. In this embodiment, the rotational phase detected object 44 is made of a pin-shaped magnetic body.

Next, the case where the magnetic sheet jacket 3 is attached to the magnetic recording device 1 will be explained.

First, the magnetic sheet jacket 3 is inserted through the cassette insertion opening 52e of the cassette holder 4. Then, the lid 47 is opened by the lid opening protrusion 46 provided in one side 52a of the cassette holder 4.
is pushed out of the window 7. Therefore, part of the magnetic recording surface 6a of the magnetic sheet 6 is exposed through the window 7. Next, push in the magnetic sheet jacket 3 so that its front edge is connected to the connecting part 52 of the receiving frame 52.
When the case cover 18 is pressed down against the receiving frame 52 in this state, the connecting portion 5
2f, the front side 18c of the case cover 18, and the magnetic sheet jacket 3 are surrounded, so that the jacket 3 is positioned and fixed at a predetermined position within the cassette holder 4. At this time, the sheet regulating surface 19c of the regulating plate 19
Since the window 7 is faced from above, the sheet regulating surface 19c faces a part of the recording surface 6a of the magnetic sheet 6.

Next, when the cassette holder 4 is pushed into the magnetic recording apparatus 1 with the jacket 3 loaded at a predetermined position in the holder 4, the jacket 3 passes through the center hole 48 formed in the center of the jacket 3. The fixed shaft 23 is inserted into the insertion hole 22 of the reinforcing member 9 provided at the center of rotation of the magnetic sheet 6 in the housing 5 . At the same time, the lower end surfaces 33a, 3 of the interval adjustment screws 33, 34 screwed into the regulating portion 19c
4a passes through the window 7 of the jacket 3 and abuts on and engages with the heads 17a, 17a of the height regulating pins 17, 17 set on the guide plate 12, as shown in FIG. The lower end surface 26a of the interval adjustment screw 26 screwed onto the mounting portion 19b of the regulating plate 19 abuts and engages with the tip 23a of the fixed shaft 23, so that the regulating plate 19 faces the magnetic head 8. The interval position is determined by height regulating pins 17, 1 on the guide plate 12 side.
7 and the tip 23a of the fixed shaft 23 as standards.

In this case, since the regulating plate 19 is movably attached to the cassette holder 4, the regulating plate 19 can be attached to the magnetic head 8 regardless of the position of the case cover 18 of the cassette holder 4 with respect to the mounting board 2. The spring force of the compression spring 31 allows for accurate and reliable positioning.

When the locking claws 59 provided on the mounting board 2 side are inserted into the engagement holes 18d provided in the front side portion 18c of the case cover 18 and are in a locked state, an opening is formed in a part of the jacket housing 5. The magnetic head 8 and the sheet guide surface 27a of the guide plate 27 are inserted into the window 7, and the magnetic recording surface 6a facing inside the window 7 faces the sheet guide surface 27a. becomes. Therefore, the area around the magnetic recording surface 6a on which the magnetic head 8 slides against the magnetic sheet 6 is formed by the sheet regulating surface 19c and the sheet guiding surface 27.
a, it is held between the upper and lower directions at a predetermined interval.

Next, when the rotary table 10 is rotated with the magnetic head 8 in contact with the magnetic recording surface 6a of the magnetic sheet 6, the magnet 43 provided on the rotary table 10 and the magnetic sheet 6 side are rotated. Since the magnetic sheet 6 is integrally attached to the magnetic body 42 by magnetic force, the magnetic sheet 6 is rotated in synchronization with the rotary table 10 in the same direction. When the magnetic sheet 6 rotates, a rotational position detected object 44 is formed on the upper surface of the magnetic body 42, and at the position of the regulation plate 19 corresponding to this detected object 44,
Since the detection coil 37 is arranged, the detected object 44 rotates while passing directly under the detection coil 37. In this case, since the part where the rotational phase detected object 44 is located forms a different magnetic field than other parts, the detection coil 3
Each time the detected object 44 approaches 7,
In the detection 37, a certain pulse-like signal is generated by electromagnetic induction according to the action of the magnetic field. vice versa,
When the detected object 44 leaves the detection coil 37, the magnetic field returns to normal and no signal is generated, but the detected object 44 moves away from the detection coil 37 again.
When the vehicle approaches , a pulsed position detection signal is generated in the detection coil 37 again. In this way, each time the rotary table 10 is driven one rotation, a pulse-like signal is sent to the detection coil 37.
It will be generated periodically in response to the rotation speed of. Therefore, by performing the rotational alignment of the rotary table 10 and the magnetic sheet 6 using this periodic signal as a reference, it is possible to align them extremely easily and reliably. Moreover, the magnetic head 8
Since the detection coil 37 is arranged on the regulating plate 19 whose height position and positioning with respect to the fixed shaft 23 is realized with high precision, the fixed shaft 2
The detection coil 37 is placed at a predetermined position with a desired spacing relative to the rotational phase detected object 44 within the reinforcing member 9 of the magnetic sheet 6 placed on the rotating table 10 placed around the magnetic sheet 3. be able to. Therefore, the detection object 44 can be detected with high precision by the detection coil 37.

When the rotary table 10 rotates at high speed and the magnetic sheet 6 also rotates in the same direction, for example, still image information is recorded at the innermost or outermost lower surface position of the magnetic recording surface 6a so as to form the current recording track. magnetically recorded. Immediately after one rotation of the magnetic sheet 6 is completed and the required information is recorded at that position, the head movement operation unit 13 is driven and the operation unit 13 is immediately driven.
The magnetic head 8 is automatically sent to a position adjacent to the recorded track, and the dial display member 49 provided on the jacket housing 5 is rotated by the rotation pin 50 provided on the side of the magnetic recording device 1.
An indicator portion 50a provided on the pin 50 points to the "1" position on the scale 51. Therefore, the current number of recorded tracks can be reliably visually confirmed with the naked eye by the position of the indicator portion 50a indicating the scale 51.

Next, from the innermost or outermost circumference of the magnetic sheet 6,
At the position of the second magnetic track, required information is magnetically recorded by the magnetic head 8 while rotating the magnetic sheet 6 at high speed. In this way, the magnetic head 8 is moved to a predetermined position on the magnetic sheet 6 by the head movement operation unit 13 every rotation in the radial direction of the magnetic sheet 6, and at that moving position, the required information is transferred to the annular magnetic track. It is magnetically recorded as it forms.

Next, the sheet guiding surface 27a of the guide plate 12 and the sheet regulating surface 1 of the regulating plate 19 relative to the magnetic head 8 are
To fine-tune the distance between 9c and 9c, remove case cover 1.
Since driver insertion holes 59a, 59b, 59c are provided in 8, these insertion holes 59a, 59
What is necessary is to insert a screwdriver or the like through b and 59c and screw in or loosen the respective interval adjustment screws 26, 33, and 34. Therefore, the optimum spacing position of the regulating plate 19 with respect to the guide plate 12 can be easily and quickly set. Also, space adjustment screw 2
Since the adjustment of 6, 33, and 34 can be performed from outside the case cover 18, it can be performed even after the magnetic sheet jacket 3 is attached to the magnetic recording apparatus 1 or while the magnetic sheet 6 is rotating. Further, since the detection coil 37 is attached to the regulation plate 19, the distance between this coil 37 and the rotational phase detected object 44 is also adjusted by the distance adjusting screws 26, 3.
This can be easily done by adjusting 3 and 34.

〔Effect of the invention〕

As is clear from the above description, in the present invention,
Since the regulating plate is movably attached to the cassette holder, when the cassette holder is moved to a position where the magnetic sheet can be operated, the regulating plate can be accurately regulated in position relative to the magnetic head.

Further, in the present invention, since the regulating plate is provided with a spacing adjustment screw, the spacing between the regulating plate and the magnetic head can be adjusted.

Further, in the present invention, the criterion for adjusting the distance between the regulating plate and the magnetic head using the distance adjusting screw is at least the position of the center of rotation of the magnetic sheet;
It is determined by two points: outside the outer periphery of the magnetic sheet and inside the supervisory seat jacket.
The position of the regulating plate can also be set correctly with respect to the magnetic sheet.

Furthermore, in the present invention, since the spacing adjustment screw can adjust the spacing from the position opposite to the regulating plate across the cassette holder, even after the magnetic sheet jacket has been moved to the operating position, the magnetic Even while the seat is in motion, the distance between the regulating plate and the magnetic head can be adjusted using the distance adjusting screw.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing a magnetic recording device to which the present invention is applied and a magnetic sheet jacket attached to this device, and Fig. 2 shows a rotational phase detected object embedded in a reinforcing member of the magnetic sheet. FIG. 3 is an enlarged cross-sectional view of the main part showing the correspondence relationship with the detection coil attached to the regulation plate, and FIG. Figure 4 is an enlarged perspective view of the main parts showing how the case cover, regulation plate, guide plate, etc. are installed, and Figure 5 is an enlarged cross-sectional view of the main parts as seen from the outside. A left side view showing the state, FIG. 6 is a front view of the state shown in FIG. 5 above, and FIG. 7 is a bottom view for explaining the relationship between the detection coil provided on the regulation plate and the rotational phase detected object. It is a diagram. 1...Magnetic recording device, 2...Mounting board, 3...
magnetic sheet jacket, 4...cassette holder,
6... Rotating magnetic sheet, 8... Magnetic sheet, 9...
... Reinforcement member, 10 ... Turntable, 12 ... Guide plate,
17, 17... Height regulation pin, 18... Case cover, 19... Regulation plate, 19c... Seat regulation surface, 23... Fixed shaft, 26, 33, 34... Spacing adjustment screw, 37... Detection Coil, 42... Magnetic material, 44... Rotational phase detected object.

Claims (1)

[Scope of Claims] 1. The above-mentioned magnetic sheet jacket is movable with respect to the mounting board between an insertion position where the magnetic sheet jacket can be inserted and an operation position where the magnetic sheet built in the magnetic sheet jacket can be rotationally driven. Attach the cassette holder into which the magnetic sheet jacket will be inserted,
The mounting board is provided with a guide plate for guiding the magnetic sheet and a magnetic head, and the cassette holder is provided with a regulating plate for regulating the position of the magnetic sheet, which is movably attached to the cassette holder. A rotating magnetic sheet device characterized in that when the cassette holder is moved to the operating position, the position of the regulating plate is regulated relative to the guide plate and the magnetic head. 2. The rotating magnetic sheet device according to claim 1, wherein the regulating plate is provided with a spacing adjustment screw for adjusting the spacing between the guide plate and the magnetic head. 3 The criteria for adjusting the distance between the guide plate and the regulating plate with respect to the magnetic head using the distance adjusting screw is as follows:
At least the rotation center position of the magnetic sheet,
3. The rotating magnetic sheet device according to claim 2, wherein the position is determined by two points: one outside the outer periphery of the magnetic sheet and one inside the sheet jacket. 4. The rotating magnetic sheet device according to claim 2, wherein the distance adjusting screw is configured to be able to adjust the distance from a position opposite to the regulating plate across the cassette holder.